<html>
<head>
<meta charset="utf-8"></meta>
<style type="text/css">
	#msg_win{border:1px solid #A67901;background:#EAEAEA;width:250px;position:absolute;right:2;margin:0px;display:none;overflow:hidden;z-index:99;}
	#msg_win .icos{position:absolute;top:2px;*top:0px;right:2px;z-index:9;}
	.icos a{float:left;color:#833B02;margin:1px;text-align:center;text-decoration:none;font-family:webdings;}
	.icos a:hover{color:#fff;}
	#msg_title{background:#FECD00;border-bottom:1px solid #A67901;border-top:1px solid #FFF;border-left:1px solid #FFF;color:#000;height:25px;line-height:25px;text-indent:5px;}
	#msg_content{margin:2px;width:300px;height:200px;overflow:hidden;}
</style>
</head>
<body>
	<p style="height:1000px;"></p>
	<div id="msg_win" style="display:block;top:490px;visibility:visible;opacity:1;">
		<div class="icos"><a id="msg_min" title="最小化" href="javascript:void 0">_</a><a id="msg_close" title="关闭" href="javascript:void 0">×</a></div>
		<div id="msg_title">任务警告信息：</div>
		<div id="msg_content"></div>
	</div>
</body>
</html>
<script language="javascript">
	var Message={
		set: function() {//最小化与恢复状态切换
			var set=this.minbtn.status == 1?[0,1,'block',this.char[0],'最小化']:[1,0,'none',this.char[1],'恢复'];
			this.minbtn.status=set[0];
			this.win.style.borderBottomWidth=set[1];
			this.content.style.display =set[2];
			this.minbtn.innerHTML =set[3]
			this.minbtn.title = set[4];
			this.win.style.top = this.getY().top;
		},
		close: function() {//关闭
			this.win.style.display = 'none';
			window.onscroll = null;
	},
	setOpacity: function(x) {//设置透明度
		var v = x >= 100 ? '': 'Alpha(opacity=' + x + ')';
		this.win.style.visibility = x<=0?'hidden':'visible';//IE有绝对或相对定位内容不随父透明度变化的bug
		this.win.style.filter = v;
		this.win.style.opacity = x / 100;
	},
	show: function() {//渐显
		clearInterval(this.timer2);
		var me = this,fx = this.fx(0, 100, 0.1),t = 0;
		this.timer2 = setInterval(function() {
		t = fx();
		me.setOpacity(t[0]);
		if (t[1] == 0) {clearInterval(me.timer2) }
		},10);
		},
		fx: function(a, b, c) {//缓冲计算
		var cMath = Math[(a - b) > 0 ? "floor": "ceil"],c = c || 0.1;
		return function() {return [a += cMath((b - a) * c), a - b]}
	},
	getY: function() {//计算移动坐标
		var d = document,b = document.body, e = document.documentElement;
		var s = Math.max(b.scrollTop, e.scrollTop);
		var h = /BackCompat/i.test(document.compatMode)?b.clientHeight:e.clientHeight;
		var h2 = this.win.offsetHeight;
		return {foot: s + h + h2 + 2+'px',top: s + h - h2 - 2+'px'}
	},
	moveTo: function(y) {//移动动画
		clearInterval(this.timer);
		var me = this,a = parseInt(this.win.style.top)||0;
		var fx = this.fx(a, parseInt(y));
		var t = 0 ;
		this.timer = setInterval(function() {
		t = fx();
		me.win.style.top = t[0]+'px';
		if (t[1] == 0) {
		clearInterval(me.timer);
		me.bind();
		}
		},10);
	},
	bind:function (){//绑定窗口滚动条与大小变化事件
		var me=this,st,rt;
		window.onscroll = function() {
		clearTimeout(st);
		clearTimeout(me.timer2);
		me.setOpacity(0);
		st = setTimeout(function() {
		me.win.style.top = me.getY().top;
		me.show();
		},600);
	};
	window.onresize = function (){
		clearTimeout(rt);
		rt = setTimeout(function() {me.win.style.top = me.getY().top},100);
		}
	},
	init: function() {//创建HTML
		function $(id) {return document.getElementById(id)};
		this.win=$('msg_win');
		var set={minbtn: 'msg_min',closebtn: 'msg_close',title: 'msg_title',content: 'msg_content'};
		for (var Id in set) {this[Id] = $(set[Id])};
		var me = this;
		this.minbtn.onclick = function() {me.set();this.blur()};
		this.closebtn.onclick = function() {me.close()};
		this.char=navigator.userAgent.toLowerCase().indexOf('firefox')+1?['_','::','×']:['0','2','r'];//FF不支持webdings字体
		this.minbtn.innerHTML=this.char[0];
		this.closebtn.innerHTML=this.char[2];
		setTimeout(function() {//初始化最先位置
		me.win.style.display = 'block';
		me.win.style.top = me.getY().foot;
		me.moveTo(me.getY().top);
		},0);
		return this;
	}
	};
	Message.init();
</script>